Structure of deep groove ball bearing basically include inner ring&comma; outer ring&comma; roller elements and cages&period; Seal rigns and dust shields are designed to prevent foreign matters like dust or oils from entering&period; The main purpose of lubricant used is to achieve the reduction of friction and damage of roller elements&period;

CageIn daily operations&comma; cage will be subjected not only to mechanical action from friction&comma; tension and inertial force&comma; but to chemical reaction from lubricants&comma; additives&comma; solvents or coolants&period; Therefore&comma; design and materials of cage are very inportant for its performance and the reliability of bearing in usage&period;Flate&sol;FUDA offers the following kinds of cage for deep groove ball bearings&colon;

Rivet type cage<img src&equals;"http&colon;&sol;&sol;g03&period;s&period;alicdn&period;com&sol;kf&sol;HTB1TbmoHXXXXXXQXFXXq6xXFXXXX&sol;221983213&sol;HTB1TbmoHXXXXXXQXFXXq6xXFXXXX&period;jpg" alt&equals;"2015 Made in China Fast Motor Bearing Deep Groove Ball Bearing with Reliable Quality" style&equals;"display&colon; block&semi; margin-left&colon; auto&semi; margin-right&colon; auto&semi;" ori-width&equals;"121" ori-height&equals;"101">It is a kind of cage made by strip steels in high precision&comma; turned into spherical pockets through profiling and fixed with rivets&comma; usually applied to small and medium deep groove ball bearings&period;

Crank jaw type cage<img src&equals;"http&colon;&sol;&sol;g03&period;s&period;alicdn&period;com&sol;kf&sol;HTB10iisHXXXXXb7XXXXq6xXFXXXE&sol;221983213&sol;HTB10iisHXXXXXb7XXXXq6xXFXXXE&period;jpg" alt&equals;"2015 Made in China Fast Motor Bearing Deep Groove Ball Bearing with Reliable Quality" style&equals;"display&colon; block&semi; margin-left&colon; auto&semi; margin-right&colon; auto&semi;" ori-width&equals;"111" ori-height&equals;"95">It is a kind of cage made by strip steels in high precision&comma; turned into spherical pockets through profiling and caulked by crank jaw and two pairs of retainers&comma; usually applied to miniature deep groove ball bearings&period;

Cage with synthetic resin material<img src&equals;"http&colon;&sol;&sol;g03&period;s&period;alicdn&period;com&sol;kf&sol;HTB18lOqHXXXXXX0XpXXq6xXFXXXP&sol;221983213&sol;HTB18lOqHXXXXXX0XpXXq6xXFXXXP&period;jpg" alt&equals;"2015 Made in China Fast Motor Bearing Deep Groove Ball Bearing with Reliable Quality" style&equals;"display&colon; block&semi; margin-left&colon; auto&semi; margin-right&colon; auto&semi;" ori-width&equals;"125" ori-height&equals;"100">Synthetic resin cage is made by combination of several materials&comma; including nylon PA66 with glass fiber&period; It has self-lubricating and low noise features&comma; usually used for bearings with extremely low noise&period;

Materials of BearingsMaterials for bearing rings and parts largely determine the bearing's performance and life&period; FLATE&sol;FUDA puts more efforts to select materials for bearing rings and part suppliers in a rigorous manner&period;Materials and components of bearing rings for FLATE&sol;FUDA bearings are provided by the world's top suppliers special for serving bearign manufacturers&comma; fundamentally solvign the issue that our bearings lag behind imported bearings in terms of materialsfor a long time&period;FLATE boasts a set of strict and polished incoming goods inspection system&period; Before being put into storage&comma; every batch of steels and parts is under systemic inspection&comma; including analysis of material composition&comma; metallographice analysis&comma; accuracy check&comma; assembly test&comma; etc&period;Materials for Bearing Ring and Roller BodyBearing ring and roller body are mainly made of high C-Cr bearing steel&period; Listed below are compositions of material for bearing ring and roller body&period;

Steel Code

Chemical composition&percnt;

Gcr15SAE52100DIN 100 Cr6JIS SUJ2

C

Si

Mn

P

S

Cr

Mo

Cu

Ni

0&period;95-1&period;05

0&period;15-0&period;35

0&period;25-0&period;45

<0&period;025

<0&period;025

1&period;40-1&period;65

-

<0&period;25

<0&period;30

Material for bearing ring and roller body mainly consists of high C-Cr bearing steel&period;Material of cagesMaterial of cages need good wear resistance&comma; stable size and metal strength&period; Therefore&comma; operation environment should be mainly considered in selection of material of cages&period;Drawing steel sheet cageThese light cages hold a high strength with reduced friction and wear in an effective way after surface treatment&period; The following table covers compositions of material for cold-rolled steel sheet&period;

Steel code

Chemical Composition&percnt;

JISG 3141SPCC

C

Si

Mn

P

S

Ni

Cr

<0&period;12

-

<0&period;5

<0&period;04

<0&period;045

-

-

Brass cageCut brass cage is adopted in small and medium bearings&period; However&comma; brass cage is not suitable for compressors with ammonia cooling due to potential seasonal cracking of brass&period; It is recommended to replace it with iron cage&period;Nylon cageAccording to the type and usage of bearings&comma; nylon cages are widely adopted&comma; but they are inappropriate for environments where the temperature is above 120ºC or below 40 ºC&period; Most of cast molding cages adopt nylon PA66 material&comma; with or without glass fiber reinforcement whose advantage is a good combination of strength and elasticity&period;Materials for dust shield and seal ringMaterial for dust shieldFLATE&sol;FUDA bearings use cold-rolled tin plate as the standard mateiral for dust shields&comma; but also use stainless steel of AISI-300 specification at times&period;Material for seal ringSeal rings are mainly made of NBR&period; For high temperature&comma; fluororubbers and silicon rubbers are widely used as well&period;

poor waterproof performance&semi;unsuitable for working condition of ultra-low temperature

Warning&colon;flurorubber is safe and harmless under normal working condition of below 200ºC&comma; but it will give off smoke if the temperature exceeds the ultimate temperature of 300ºC that is equivalent to flame for cutting steel tubes&period; Inhalation of the smoke is harmful to human bodies including eyes&period; In addition&comma; the smoke should be avoided to contact skin&period;

Lubrication of Bearings

Grease lubrication

Lipid lubricants are much easier to use than oil lubricants&period; Due to its ciscosity&comma;grease is more durable and only needs simple sealing equipment to contain&period; Grease is hard to be changed&comma; beacause the usual approach of it is to press grease into device to make fresh grease squeeze used grease out&period; General speaking&comma; grease with low viscosity primary oil is more suitable for high speed operations at low temperature&comma; while grease with high viscosity primary oil is suitable for heavy load&period;

Oil lubrication

Oil lubrication is more suitbale for applications under conditions of high speed and high temperature&comma; effectively taking the heat generated in operation of bearings away&period; Viscosity of oil determines the effects of oil lubrication&period; Low viscosity will lead to inadequate formation of oil film&comma; while high viscosity will increase viscous drag and temperature&period; In general&comma; the higher rotational speed is the lower viscosity of lubricant oil will be&semi; the larger load is&comma; the higher viscosity of lubricant oil will be&period;

Primary oil

In grease&comma; primary oil accounts for 75-96&percnt;&period; In mass fraction&comma; the performance of grease mainly relies on the nature of primary oil&period; Particularly when it is with cold flow property and at high temperature&comma; its service life is bound up with primary oil&period; Grease with low viscosity primary oil is usually applicable to low temperature and low load&comma; while lubrication grease with high viscosity primary oil is applied to high temperature and high load&period; Primary oil used in grease includes mineral oil and synthetic oil&period; The commonly used synthetic primary oils contain lipid oil&comma; sythetic hydrocarbon oil&comma; perfluoropolyether&comma; silicon oil and PPO&comma; etc&period;

Thickener

Thickener generally accounts for 4~20&percnt; in mass fraction&period; Its functions are to suspend primaty oil&comma; reduce the flow of primaty oil&comma; and increase adhesion of oil to friction surface&period; Thickener has two categories&colon; metallic soap base and non-metallic soap base&period; Critical operating temperature&comma; mechanical stability&comma; water resistance and other properties of grease are determined by thickener&comma; for example&comma; sodium soap base can react with water to form a kind of latex&comma; which can not be applied to running bearing in the atomsphere of high temperature&period;

Additive

In grease&comma; primary oil accounts for 0&period;5~10&percnt;&period; In mass fraction&comma; which is used for the improvement of operating performance and life of grease&period; Accordign to the classification by function&comma; it can be divided into thickener&lpar;strong adhesion&rpar;&comma; antioxidant&comma; extreme-pressure additive&comma; corrosion inhibitor&comma;etc&period;